Chemical Engineering - Process Equipment and Plant Design

6. 

for fully open globe value may be around

A. 10
B. 25
C. 75
D. 300

Answer: Option D

Explanation:

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7. 

Lug support is

A. the most suitable for thick vertical vessel.
B. same as bracket support.
C. provided usually for vessels of much smaller height than skirt supported vessels.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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8. 

Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.

A. Bubble cap trays though most expensive are the best in situations, where low vapour rates is to be handled and a positive liquid seal is essential at all flow rates.
B. Murphree efficiency of all the three trays are nearly equal, however the peak efficiency is generally higher for seive and valve trays than the bubble cap.
C. Maintenance cost for valve and seive trays are comparatively more than bubble cap tray due to their relatively complicated construction features.
D. Valve trays have the highest turn down ratio (i.e. the ratio of the highest to the lowest vapour flow rates) and thus provides the maximum flexible operating range.

Answer: Option C

Explanation:

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9. 

With increase in the number of shell passes, the value of FT

A. increases
B. decreases
C. remains same
D. remains same, only if the number of tube passes does not change.

Answer: Option A

Explanation:

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10. 

Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.

A. 1.5 to 2
B. 2.5 to 5
C. 5 to 10
D. 10 to 15

Answer: Option B

Explanation:

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